Definition of "main-deck" [main-deck]

• In merchant ships, that part of the upper deck which lies between the forecastle and the poop; in men-of-war, the deck next below the spar-deck; the gun-deck. See deck, 2. (noun)

The Century Dictionary (Public Domain)

• "As I held up my gun and gazed at the abruptly-deserted main-deck I was aware of Wada's touch on my arm."
• "The main-deck entrance, on the port side, was into a wide, well-carpeted hallway."
• "On the forward main-deck was a big canvas tank with six feet of sea-water."